Valve lifter



Patented Apr. 14, 1925.

l,.i33,30'i

lm'lalii'l QlTFECE.

SELIDEN SCRANTON DAVIS, QF SOTJTII EAESADENA, CALIFORNIA.

'VALVE LIFTEIBI.

i Application led March, 29, 1823. Serial No. 628,600.

T all 'whom 'it may concern:

Be it known that I, SLLnnN SGRANTON Davis, a citizenof the United States, and `a resident of South Pasadena, county of Los Angeles, and Stat-e of California, have invent-ed a new and useful Valve Litter, ot which the following is a. specification.

The present invention relates to improvements in valvelifting :devices and is par- "10 t-icularly designed to be used in connection ywith the valves of the engine of a motor vehicle. These valves are ordinarily arranged in such a manner that a plurality of the same are aligned with one another and are raised successively by means or a cam shaft disposed underneath the same. To seat each valve a spring is commonly used which b-ears on a pin extending through the valve stem and `in most types of automobiles presses the valve downwardly. When it is desired to remove a valve for cleaning purposes it becomes necessary to remove the pin vpreviously referred to, which allows the valve andl the valve stem to be with drawnl through the spring. Even if it is desired to grind the valve without removing the same, it is necessary to remove this pin because the pressure ot the spring, which usually is rather strong, interferes with the proper grinding operation. The removal of this pin, as well as the insertion of the same, after completing the operation is very difficult, due to the fact that little space is at the disposal of the operator and a number of devices have, therefore, been designed to facilitate this operation. In the present invention it is pro-posed to disclose atool orthispurpose which is extreme-ly simple in construction and inexpensive, and zu) which for the larger part utilizes means at the disposal of the operator' by the. inherent vconstruction of the engine. rlhe principal advantages of my 4device will appear as the specification proceeds.

The preferred form of my invention `illustrated in the accompanying drawing in which Figure l shows a` perspective view of my tool, Figure 2 a. vertical longitudinal section through a common type of a motor vehicle engine, with those portions not ot immediate interest being omitted, Figures 3 and t detail views showing means for temporarily raising the valves, Figure 5a top plan View of the illustration shown in Figure 4, Figures' .6 and 7 diagrammatic views further illustrating the operation of my device, and Figure 8 a detail view showing the exact position of the pin relative to the tool shown in Figure 1. llhile I have shown only the preferred torni ot' the invention, it should be understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit or the invention.

Of the engine (1) only those parts arc shown which are of immediate interest Jfor the purpose of disclosing the operation oi my invention. The engine block (2) is shown as being provided with eight valves (3) to (10) respectively, some oit which are intake valves and other exhaust valves. The valves which normally rest on the seats (11) con'ununicating with the interior of the cylinders not shown in the drawing are provided with downwardly extending stems (12) adapted to be successively raised b v means of push rods (13) operated by a cam shaft (141e) which receives rotary motion from the crank shaft of the enginey in a manner not shown in the drawing. The cams (16) on the cani shaft are arranged to raise the valves successively in accordance with the requirements ot the particular engine for which the valve arrangement is made. The push rods (13) are usually made of larger circumference than the valve stems (12) or are provided at their top ends with suitable collars (15) of larger cross sectional area. than the valve stems. The latterconstruction is selected in this drawing io'r the purposev of illustrating the invent-ion. The push rods are usually gui-ded in bosses (17) Vilhile the successivo raising ci the valves is thus accomplished by means of the cam shaft (14E), the seating of the valve is brought about by means of springs (1S) bearing on the lower tace of the top member oit the engine bloclr (2) and on a pin (19) extending through the valve stem,

a washer (21) being ordinarily interposed between the pin (19) and the spring for the purpose oit furnishing a better seat for the latter.

No novelty is claimed :tor the device thus far described, which merely illustrates an arrangement commonly found in the present motor vehicles. The principal part` of my engine is the plate (22) illustrated in Figuse 1 and certain wedge members (25) used AlO temporarily for holding the valves iii a raisedposition. rllhe plate 'may be of any 'suitable forni-and ot any suitable inaterial, the preferred form being shown in Figure 1 in which the olate is provided with a central perforation (213), and prongs (2l) extending from either end so as to torni re cesses (26). lThe member is preferably made wedge-shapedl as shown iiiflligures 3 'v and 4, and divided into two prongs (QS) forming a recess (29) adapted to receive the valve stem when the member is lore/ed v into lp'la'ce.

The operation oit my invention may be described as follows: lFor-thel purposes or Athis description we shall eonline ourselves to the first three valves (3), and

rllie operation is begun by' revolving the' cani shatt (14) by nie'ans'ot the crank handle ordinarily provided with motor vehicles whereby the valves (3), (il) and (5) are sueeessii'iely raised. Each valve, as soon as the saine has reached its uppermost position, is heldin that position bythev introduction of 'the 'member l(2)5) which 'is 'forced between the valve and the valve seat as tar as can conv'eiiiently be'd'one without Vhe useot tools.

After vthe valves (3),'(4) and (5) have' tlius lbeenv raised' and secured in their raised positions, further pressurev is brought te bear by any suitable line-ans such as a pry or whatever else may beat the'disposalfo't the operawith' the 'valve stems.

tor l"for raising' the: valves still higher v" ien ythe'ineni'be'rs canV be 'further 'inserted to retain thevalvesin'such elevatedpositions. lt'

will b'euiiderstood that atf'th-is time' all three valves occupy` a'positionhigher thanv they ever 'doneeupy ifactuated only so thateven itt-he eamshaitfraises one bythe camshaft `or' all of the push ro ds'to their uppermostposit-iron they will still' remain' out oi Contact Tlienext step is to rotate the cain sha-ft sufficiently tar that the push rod' of the'iniddle valve (e) is raised to its uppermost position. Then the plate (22)v is placed on top of the push rod, which it will "be understood" is su'tliei'ently lower Vthan; all-'three valve stems to allow of4 'the ree'in'trodi'ietioniot t-h'e-plateiii suoli a" manner that the-'hole ('23) which .is smaller than' the top "oii' 'thepush rod but larger than :the I'valvestenn and the two recesses at the "endet tlieplate may be brought direetly uu-` derneath Ithe three valve' stems of the valves and' leftbetweenthe top ot t-l-ie plate (22) and "thebottoinot the pin (19) et the valve (4) to allowxotthe introduetion ot' washersunderneath the plate (22), washersfare introi sutli'cient clearance' is duced untilf'tlie' plate ('22) is lraised sufrieientlyliigh toreacli the bottom of the pin (19)- lhave been raised-'te about thesame height,

Since4 presumably all 'three Vvalves the plate-will simultaneously be raised sui'iieientl'y'jfhigh'fto be' substantially on a level L valve 4).

of the valves and"(") are large enough 'to allow the' pins to drop therethrough, while f stopping the washers '(21), it :such are'pi'ovided or the 'spring (1S) it'no wi shersfvai'e provided. 1t will thus be 'seen-'thattlie valves (3) and 'are allowed to drop to their' respective v"seats while the `twoi springs (18) associated with thesevalve's' are heldin a eon'i'pressed eonditionby the' plate The removal of the pin (19) it desired for the purpose of witlidr'aw'ving` the valvesj(3) and (5) is now-an easy matter, and tlieoperation of grinding the valves maybe'ear- -iied out 'without any diiiieulty.

Neither springs nor washer need 'be *removed for the operation'and after the operation has been 'perforn'ied the valves vneed only be returned to their seats, whereupbn the pins maybe reinsertedand 'the plate' removed. To removethe plate itis `preterable, ot course, to irst'take'o'tl the pressure` of thesprings by ire-introducing the wedgges (25).

l olaiin: l 1911i combina-tion, a plurality ot' valves Vdisesed in ooerative -a'roXimitv havinfr Y .l :n

stems extending thereiroin,`-spring means 'bearing 'onl thesteins' for seating vthe valves,

iiuli'vid'ual-y elements adapted to successively raise the valves by compressing the' springs,

and means'-adaptedfto' be supported by one et said elements 'made to'hold tliefspiin'gs ot adjacent valves in a compressed condition so as to ren-der Vthe same inoperative.

'2. ln" combination, a' plurality of *valves vdisposed' in v.op'ei'rative v proximity `having stems extend-ing therefrom,@spring means bearing ontlie stems foirsea'tingjthevalves,

i i'ndividual elements"adapted to vsuccessively raise the'valves Vby compressing 'the' springs. and a plate adapted to'be' supported byoue 'oi' said `elements formed to lioldthe springs oi adjacent valvesin acompressedicoudition so'as to rendertlie 'same inoperative.

3; 'lnembiiiation, a plurality 'ot' v'valves disposed in' Vvoperativeproximity having stems extending therefrom, `Y`spring 'meansA bearing on' the stemsv for seating the valves, individual elements adapt-ed' to'suecessively raise tlievalves by eompressing the spings, and a plate adapted to'be supported "bylone oic said elements having prongs ythertin` adapted to engage the springs of adjacent `valves for compressing the same whereby they are rendered inoperative.

raised position when the `valve raising elements become inoperative, and in inserting a common member underneath the compressed springs and holding the same in a raised position by returning one of said elements to a vspring compressing position Where-by the remaining springs are held compressed Whe-n the temporary holding means are removed.

5. In a valve lifter, a plate having a central opening adapted to slidably receive a valve stem but to preventt-he passage of a spring retaining pin therethrough, and forked ends on the plate including prongs spaced apart to allow the passage oi' valve stems and their pins therethrough to engage the valve springs.

G. In combination, a plurality of valves disposed in operative proximity having stems extending therefrom, spring means bearing on the stems for seating the valves, individual slotted wedge elements adapted to successively raise the valves by compressing the springs, and a plate adapted to be supported by one of said elements formed to hold the springs of adjacent valves in a compressed condition so as to render the same inoperative.

SELDEN SCRANTON DAVIS. 

